Mensurationhard · Past Paper
A cylindrical tank has a capacity of 6160 cubic m. If its depth is 10 m, find the cost of painting its inner curved surface at Rs. 2.50 per sq. m.
ARs. 2200
BRs. 1100
CRs. 4400
DRs. 2500
✓ Correct Answer: A — Rs. 2200
Vol = πr²h = 6160. (22/7)*r²*10 = 6160 => r²=196 => r=14. CSA = 2πrh = 2*(22/7)*14*10 = 880. Cost = 880 * 2.5 = Rs. 2200.
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